linux中一个通过管道读取大量数据的程序源代码

//运行环境：ubuntu9

//可以实现对管道的多次读取

 #include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main()
{

FILE *read_fp;

 char buffer[BUFSIZ+1];

 int chars_read;
 memset(buffer,'\0',sizeof(buffer));

 read_fp=popen("ps -al","r");

 if(read_fp!=NULL){
 chars_read=fread(buffer,sizeof(char),BUFSIZ,read_fp);
 while(chars_read>0) {
 buffer[chars_read-1]='\0';
 printf("Reading %d :-\n%s\n",BUFSIZ,buffer);
 chars_read=fread(buffer,sizeof(char),BUFSIZ,read_fp);
 }
 pclose(read_fp);
 exit(EXIT_SUCCESS);
 }
 exit(EXIT_FAILURE);
}